<template>
  <div>
    <!-- 导航栏 -->
    <van-nav-bar title="登录">
      <van-icon slot="left" name="cross" @click="$router.back()" />
    </van-nav-bar>
    <!-- 登录表单 -->
    <!-- 表单验证：
        1、给 van-field 组件配置 rules 验证规则
          参考文档：https://youzan.github.io/vant/#/zh-CN/form#rule-shu-ju-jie-gou
        2、当表单提交的时候会自动触发表单验证
           如果验证通过，会触发 submit 事件
           如果验证失败，不会触发 submit -->
    <van-form ref="loginForm" @submit="onSubmit">
      <van-field
        v-model="user.mobile"
        :rules="userFromRules.mobile"
        name="mobile"
        placeholder="请输入手机号"
        type="number"
        maxlength="11"
      >
        <i slot="left-icon" class="toutiao toutiao-shouji"></i>
      </van-field>
      <van-field
        v-model="user.code"
        name="code"
        placeholder="请输入验证码"
        :rules="userFromRules.code"
        type="number"
        maxlength="6"
      >
        <i slot="left-icon" class="toutiao toutiao-yanzhengma"></i>
        <template #button>
          <van-count-down
            v-if="isCountDownShow"
            :time="1000 * 5"
            format="ss s"
            @finish="isCountDownShow = false"
          />
          <van-button
            v-else
            @click="onSendSms"
            native-type="button"
            class="send-sms-btn"
            round
            size="small"
            type="default"
            >发送验证码</van-button
          >
        </template>
      </van-field>
      <div class="login-btn-wrap">
        <div style="margin: 16px">
          <van-button class="login-btn" block type="info" native-type="submit"
            >登录</van-button
          >
        </div>
      </div>
    </van-form>
  </div>
</template>

<script>
import { login, getSmsCode } from '@/api/user.js'
export default {
  name: 'App',
  data() {
    return {
      user: {
        mobile: 13911111111, // 手机号
        code: 246810 // 验证码
      },
      userFromRules: {
        mobile: [
          {
            required: true, // 必填项
            message: '手机号不能为空'
          },
          {
            pattern: /^1[3|5|7|8]\d{9}$/,
            message: '手机号格式错误'
          }
        ],
        code: [
          {
            required: true,
            message: '验证码不能为空'
          },
          {
            pattern: /^\d{6}$/,
            message: '验证码格式错误'
          }
        ]
      },
      isCountDownShow: false
    }
  },
  methods: {
    async onSubmit() {
      // 获取表单数据
      const user = this.user
      // 验证表单
      // 请求
      // 开始转圈圈
      this.$toast.loading({
        duration: 0, // 持续时间，0表示持续展示不停止
        forbidClick: true, // 是否禁止背景点击
        message: '登录中...' // 提示消息
      })

      try {
        const { data } = await login(user)
        // console.log('登录成功', res)
        this.$store.commit('setUser', data.data)
        this.$toast.success('登录成功')
        // 登录成功，跳转回原来页面
        // back 的方式不严谨，后面讲功能优化的时候再说
        this.$router.back()
      } catch (err) {
        // console.log(err)
        if (err.response.status === 400) {
          console.log('手机号或者验证码错误')
          this.$toast.fail('登录失败，手机号或验证码错误')
        } else {
          console.log('登录失败,请稍后再试', err)
          this.$toast.fail('登录失败,请稍后再试')
        }
      }
    },
    async onSendSms() {
      console.log('onSendSms')
      // 1. 校验手机号
      try {
        await this.$refs.loginForm.validate('mobile')
      } catch (err) {
        return console.log('验证失败', err)
      }
      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true
      // 3. 请求发送验证码
      try {
        await getSmsCode(this.user.mobile)
        this.$toast('发送成功')
      } catch (err) {
        if (err.response.status === 429) {
          this.$toast('发送的太频繁,请稍后再试')
        } else {
          this.$toast('发送失败,请稍后再式')
        }
      }
    }
  }
}
</script>

<style scoped lang="less">
.toutiao {
  font-size: 37px;
}
.send-sms-btn {
  widows: 152px;
  height: 46px;
  line-height: 46px;
  background-color: #ededed !important;
  font-size: 22px;
  color: #666;
}
.login-btn-wrap {
  padding: 53px 33px;
  .login-btn {
    background-color: #6db4fb;
    border: none;
  }
}
</style>
